"Suppose one little old lady in ten carries a gun. Suppose that one in ten of those, if attacked by a mugger, succeeds in killing the mugger instead of being killed by him -- or shooting herself in the foot. On average, the mugger is much more likely to win the encounter than the little old lady. But -- also on average -- every hundred muggings produces one dead mugger. At those odds, mugging is an unprofitable business -- not many little old ladies carry enough money to justify one chance in a hundred of being killed getting it. The number of muggers declines drastically, not because they have all been killed but because they have, rationally, sought safer professions."
David D. Friedman
(1945- ) American economist, physicist, legal scholar, and libertarian theorist
Hidden Order: The Economics of Everyday Life (New York: Harper, 1996), p. 299
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